/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.mock.web.test;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Mock implementation of the {@link javax.servlet.ServletConfig} interface.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 1.0.2
 */
public class MockServletConfig implements ServletConfig {

    private final ServletContext servletContext;

    private final String servletName;

    private final Map<String, String> initParameters = new LinkedHashMap<>();


    /**
     * Create a new MockServletConfig with a default {@link MockServletContext}.
     */
    public MockServletConfig() {
        this(null, "");
    }

    /**
     * Create a new MockServletConfig with a default {@link MockServletContext}.
     *
     * @param servletName the name of the servlet
     */
    public MockServletConfig(String servletName) {
        this(null, servletName);
    }

    /**
     * Create a new MockServletConfig.
     *
     * @param servletContext the ServletContext that the servlet runs in
     */
    public MockServletConfig(@Nullable ServletContext servletContext) {
        this(servletContext, "");
    }

    /**
     * Create a new MockServletConfig.
     *
     * @param servletContext the ServletContext that the servlet runs in
     * @param servletName    the name of the servlet
     */
    public MockServletConfig(@Nullable ServletContext servletContext, String servletName) {
        this.servletContext = (servletContext != null ? servletContext : new MockServletContext());
        this.servletName = servletName;
    }


    @Override
    public String getServletName() {
        return this.servletName;
    }

    @Override
    public ServletContext getServletContext() {
        return this.servletContext;
    }

    public void addInitParameter(String name, String value) {
        Assert.notNull(name, "Parameter name must not be null");
        this.initParameters.put(name, value);
    }

    @Override
    public String getInitParameter(String name) {
        Assert.notNull(name, "Parameter name must not be null");
        return this.initParameters.get(name);
    }

    @Override
    public Enumeration<String> getInitParameterNames() {
        return Collections.enumeration(this.initParameters.keySet());
    }

}
